planner: fix same index read plan but has different plan digest (#31560)#31654

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ti-srebot wants to merge 2 commits intopingcap:release-5.4from ti-srebot:release-5.4-0a3bcc689f27

+17-5

Commits on Jan 13, 2022

cherry pick pingcap#31560 to release-5.4

crazycs520
authored and
ti-srebot
committed

Commits on Feb 7, 2022

Merge branch 'release-5.4' into release-5.4-0a3bcc689f27
crazycs520
authored